🎨 Palette: Add ARIA labels to icon-only toggle buttons

[endlessblink]

💡 What: Added aria-label, aria-pressed, and aria-expanded attributes to icon-only toggle buttons across ViewControls.vue, AccountSettingsTab.vue, and AISettingsTab.vue.
🎯 Why: Without these attributes, screen readers only announce "button" and lack context on what the button does or its current state (e.g. is the password currently visible or hidden?). Adding clear labels and state bindings provides proper context for keyboard and assistive tech users.
📸 Before/After: Visual presentation is identical (no CSS changes), but structural HTML is now accessible. Tooltip title properties were also refined to dynamically reflect current interaction state.
♿ Accessibility: Ensures WCAG compliance by explicitly naming buttons that rely purely on visual iconography and announcing dynamic toggle state changes.

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PR created automatically by Jules for task 7071769824628184216 started by @endlessblink

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